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Proceedings ArticleDOI

Structural and morphological studies on Bi1-xCaxMnO3 thin films grown by RF magnetron sputtering

24 May 2016-Vol. 1731, Iss: 1, pp 080064
TL;DR: In this article, X-ray diffraction pattern shows that the BiMnO3 films are crystallized in monoclinic structure with C2 space group and the crystallite size and induced strain in the prepared films are measured by W-H plot.
Abstract: Bi1-xCaxMnO3 (0 ≤ X ≤ 0.4) thin films are deposited on n–type Si (100) substrate at 800 °C by RF magnetron sputtering. X-ray diffraction pattern shows that the films are crystallized in monoclinic structure with C2 space group. The crystallite size and induced strain in the prepared films are measured by W-H plot. The cell parameters and texture coefficient of the films are calculated. The surface morphology of the films is examined by atomic force microscope. The study confirms the optimum level of calcium doping is 20 at. % in Bi site of BiMnO3 film, these findings pave the way for further research in the Ca modified BiMnO3 films towards device fabrication.
References
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Journal ArticleDOI
TL;DR: In this article, X-ray diffraction showed that Bi1−xBaxFeO3 was single phase up to x=0.25 and exhibited magnetism and ferroelectricity simultaneously at room temperature.
Abstract: Ba doped BiFeO3 compounds were prepared by a solid-state reaction. X-ray diffraction showed that Bi1−xBaxFeO3 was single phase up to x=0.25. These samples exhibited magnetism and ferroelectricity simultaneously at room temperature. The magnetoelectric coupling was evidenced by the increase of the dielectric constant with the increase of the applied magnetic field. For Bi0.75Ba0.25FeO3 with ΔH=8kOe, the values of [er(H)−er(0)]∕er(0) are 1.7% and 1% for 80 and 300K, respectively.

372 citations

Journal ArticleDOI
TL;DR: In this article, the authors collected and analyzed the recent experimental and theoretical results on Bi M O 3 with M =Al, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Ga, In, and Rh.

129 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that Ca2+ doping at Bi-site results in the release of weak ferromagnetism in BiFeO3 and structural transformation from rhombohedral to triclinic is observed with 10% Ca doping.
Abstract: It is shown that Ca2+ doping at Bi-site results in the release of weak ferromagnetism in BiFeO3. Structural transformation from rhombohedral to triclinic is observed with 10% Ca doping. Raman measurements show the presence of oxygen vacancies with Ca doping and no evidence of either intermediate valence or the tetravalence of iron is observed from Mossbauer measurements. No significant change in Neel temperature is observed with Ca doping. The observed weak ferromagnetism and ferroelectric nature at room temperature indicates the multiferroic nature of Bi1−xCaxFeO3 (x=5% and 10%) samples.

118 citations

Journal ArticleDOI
TL;DR: In this article, a resistivity of 5×107Ωcm and an effective (i.e. thickness dependent) dielectric constant of 1400 were obtained for BiMnO3 (010) films.
Abstract: BiMnO3 (010) films (100nm) were grown epitaxially on SrTiO3 (001) and 0.2at.% Nb-doped SrTiO3 (001) substrates using pulsed laser deposition. The microstructure, electrical, and magnetic properties, and indeed the formation of the correct phase, were found to be very sensitive to growth parameters. This optimization has resulted in highly resistive BiMnO3 films and thus enabled room-temperature dielectric measurements: We obtained a resistivity of 5×107Ωcm, and an effective (i.e. thickness dependent) dielectric constant of 1400. These findings pave the way for magnetoelectric measurements and further optimization.

79 citations

Journal ArticleDOI
TL;DR: In this article, the magnetic and elastic properties of Bi1-xCaxMnO3 manganites are studied and phase transformations revealed are ferromagnet-spin glass (x≥0.15) and spin glass-charge-ordered antiferromagnetic (x ≥ 0.25).
Abstract: The magnetic and elastic properties of the Bi1-x CaxMnO3 manganites are studied. The phase transformations revealed are ferromagnet-spin glass (x≥0.15) and spin glass-charge-ordered antiferromagnet (x≥0.25). The ferromagnetic state is characterized by ordering of the Mn3+ d x 2-y orbitals. It is suggested that thespin glass state originates from local static Jahn-Teller distortions. The antiferromagnetic charge-ordered and the spin-glass disordered phases coexist in samples with 0.25

31 citations